Can't back up my trailer

[Fast351]

Hardest parts are probably getting the lines loose (not sure where you are, but here in MN, everything rusts, even in the summer). Make sure you use a flare nut wrench, not an open ended line. I think there are some hard lines that attach to the solenoid.

Second is bleeding the brakes. This is just like bleeding car brakes, but it must be done if you open up the system.

[WakeSlayer]

Mine was doing this last year. However, my problem was a bad wire. It had rubbed through on a piece of the trailer frame.

[Sundance]

Hey, just checked this site. I have the same problem and after exhausting all possibilities and talking to the Actuator (UFP) guys, I have determined it is the solenoid. Going to change it our this weekend and will let you know unless you have already done it.

[HS]

Sometimes a faulty ground will prevent the solenoid from "seeing" the reverse light signal. Ask for a "lock out" key for when you get in a jamb.

[WA-H2O-SKI]

HS is right on. I wasgoing to suggest that you have a bad ground in the trailer somewhere. It works fine maybe until you get turning of backing in certain conditions. Try just running a jumper ground from the frame of your truck to the trailer. If that makes it work, then just find the faulty ground.

[steve-o]

You can also "flip" the plug on the trailers to test the solenoid is working. It engages it when the lights are on then.

[WA-H2O-SKI]

But, you will be relying on the trailer to ground through the ball on the tow vehicle if you switch the plug around. I would run an alligator clipped line from a known ground on the tow vehicle to the trailer and see if you are fighting a bad ground.

My trailer ground (wired) went bad and when I turned and headed up my slight driveway incline in reverse, the brakes would lock up. I went looking for bad grounds, purely cause it looked a WHOLE LOT easier than pulling the celinoid out of the togue........

[TravisFling]

that's good advice. I've had a wire go bad before, too. Not on that, but trailer wires are very exposed to the elements, constantly dunked in water, road debris and rocks, etc.

[AirTool]

The ground can be checked with an ohm meter.

[EchoLodge]

I grew tired of messing with the solenoid. Buy the piece that slides in between the actuator.
http://www.dhmtrailers.com/online/pr...?productid=883
It never fails! Good to have even if you can keep the solenoid working!